Electron tube



Sept. 30, 1947;

L. cRooK ELEc'rRN TUBE Filed June 30, 1942 INVENroR. Agi/a 36 @uva/af)Arron/v5 ys Patented Sept. 30; 1947 UNITED STATES PATENT OFFICEELEc'rRoN TUBE Louis H. Crook, Washington, D. C. Application June 3o,1942, serial 1410. 449,104

(el. 25o-27) 12 Claims. l

This invention relates to electron tubes having a plurality ofelectrodes.

It is an important object of this invention to provide an electrostaticshield for an electrode within an electron tube and to dispose theshield extending outwardly through the wall of the tube to shield aconductor connected to the electrode.

It is a tfurther important object of this invention to provide integralshield means housing the current sources and the conductors connectingthe current sources with the electrodes in an electron tube, and withthe shield means extending through the wall of the tube to shield theelectrodes of the tube.

It is a further important object of the invention to provide shieldedsources f direct current shielded by shielding means extending throughthe wall of an electron tube, and to connect these direct currentsources with other sources, or loads, external to the shielded sourcesby magnetic coupling.

It is an important object of this invention to assemble the electrodes,the direct current sources, and the conductors connecting the sourceswith the electrodes, of an electron tube Within a shielding arrangementwhich enters through a wall of the tube to shield the several circuitsof the tube against outside disturbing influences.

Other and further important objects of the invention will be apparent'cfrom the following description and the accompanying drawings.

In the drawings:

Figure 1 illustrates an electron tube having internal shields whichextend through a wall of the tube to house external current sources' andconnecting wires. Part of the illustration is in section and partdiagrammatic.

Figure 2 is an end view in plan of an electrode of the tube shown inFigure 1.

In Figure 1 there is shown an electronic tube or triode I0, which isprovided with a cathode II, a control grid I2, andan anode I3. Thetriode elements are housed in a gl-ass envelope I4.

For purposes of illustration, the glass envelope is shown assubstantially spherical, and the triode elements within the envelopegenerally dene portions olf spheres.

The cathode II is formed of an annulus I5, bent as shown in Figure 1,and a central terminal element I6 with a plurality of laments I Iconnected extending between the terminal i6 and the ring I5. Current issupplied to the cathode from a lbattery I8 through a conductor I9connected to the tenminal I6, and a return path is provided by asomewhat hemispherical shield 20 connected to the ring I5 within thetube and extending outwardly from the tube as a conduit 2l andconductively connected to a. casing 22 which contains the battery I8 andto which one pole of the battery is connected, as indicated at 23.

The cathode supply is, therefore, entirely contained in a shieldedsystem. The metal of the shield is of good conductivity, so that theconductor I9- is effectively shielded against disturbing outsideiniiuences.

The control grid I2 may be a'. perforated plate Vor an annulus 24supporting integrally connected grid wires as in conventional triodes,and the grid structure is bent to conform to the general shape of thecathode in spaced opposed relation to it. A generally hemisphericalshield 25 is conductively connected to the ring 24 and this shieldextends outwardly of the tube as a conduit 26 and envelopes the shield2l) in the tube and a portion of the conduit 2l. The conduit `26 bendsat an angle to the conduit 2I through an elbow, indicated at 21, and awall of the elbow is cut away to permit the conduit 2I to pass throughit, and is insulated from the conduit 2| by insulation indicated at 28.

The conduit 26 is conductively connected to a casing 29 which houses abattery 30, and one pole of the battery is connected by a conductor 3|within the conduit 26 to a point on the conduit 2i, as is indicated at32. The other pole of the battery 30 is connected through a secondarywinding 33 of a. suitable transformer 315 to the wall of the casing. Theprimary winding 35 of the transformer 34 is outside the casing forconnection to a suitable source indicated at 50, and the windings 33 and36 are magnetically coupled by a core 36 of suitable magnetic materialextending through a wall of the casing.

The grid circuit is, therefore, within an equipotential shieldedsystefm.

The anode I3 may be spherical and is suitably positioned with referenceto the grid. The anode is also within an equipotentional shieldedsystem. A somewhat hemispherical shield 31 is placed within the tube andabout the anode I3, and this shield extends outwardly of the tube as aconduit 38 which is conductively connected 40. One pole of this battery#l0 is connected by a wire 4I Within the conduit 38 to the anode I3, andthe other pole of the battery is connected to ,the casing, as indicatedat 42, through a primary winding 43 of a transformer 44. A secto acasing 39. The casing 39 houses a battery j 3 ondary winding I isdisposed outside thecasing 39 for connection to a suitable loadindicated at 5l, and the windings 43 and 45 are magnetically coupled bya core 46 of suitable magnetic material. The anode and cathodecasingsare conductively connected to lcomplete the cathodeanode circuit, andthis conductive connection is indicated at 41.

The glass envelope i4 is suitably sealed to the metal conduits 26 and 38by the conventional glass soldering method, and vacuum seals of suitableinsulating material seal the space between the conduits 28 and2l, andthe bore of the conduit 38, and the bore of the conduit 2l, as indicatedat 48, 49, and 63, respectively.

The leads I9, 3|, and 4I are suitably supported in their housingconduits by thin and spaced insulating supports 52, if necessary.

The elements within the tube may be varied as to shape to suit speciiicuses of the tube.

According to the provisions of the patent statutes, I have set forth theprinciple and mode of operation of my invention and have illustrated anddescribed what I now consider to represent its best embodiment. However,I desire to have it understood that Within the scope of the appendedclaims the invention may be practicedv otherwise than as specicallyillustrated and described.

I claim as my invention:

1. An electronic tube including an envelope and an electrode within theenvelope, a source of current connected to said electrode, and aconductive shielding conduit housing said source and entered in saidenvelope in conductive engagement with said electrode.

2. An electronic tube including an envelope and an electrode Within saidenvelope, a source of current, a conductor connecting said electrodewith said source, and conductive metallic shielding means connected tosaid source and engaging said electrode and housing said source and saidconductor.

3. An electronic tube including an electrode, a source of current, a,conductor connecting said source with said electrode, and conductivemetallic shielding means connected to said source disposed envelopingsaid source and said conductor, said shielding means extending throughthe wall of the tube and being disposed in shielding relation about saidelectrode within the tube.

4. An electronic tube including an envelope and an electrode within theenvelope, an external source of current, a iirst conductor connectingsaid source with said electrode, and a second conductor connecting saidelectrode with said source and enveloping said source and said iirstconductor both within and without said envelope.

5. An electronic tube including an electrode, a source of currentoutside said tube, conductive shield means housing said source andentered in said tube, and conductor means connecting said electrode andone pole of said source and disposed within said shielding means, saidshielding means being connected to the other pole of said sorce and alsoto said electrode Within the tu e.

6. A non-grounded circuit arrangement including an electronic tubehaving an envelope, an electrode in said envelope, a source of energyconnected to said electrode, anda conductive shielding conduit housingsaid source of energy and its connection to said electrode, saidshielding conduit extending through said envelope and being shapedinteriorly of said envelope to eiect a shielding of said electrodetherein except for l a predetermined path for electron flow. whereby thecomplete electrode circuit is shielded both inside and outside saidenvelope other than for aid electron path.

'7. In a non-grounded electronic tube circuit` v envelope except for apredetermined path of electron flow within said envelope.

8. In an electronic tube, an envelope, a plurality of electrode circuitsincluding inner and outer conductors and `contained within the outerconductor extending into said envelope', shielding means inside saidenvelope shielding said electrodes one from the other except for apredetermined path of electron flow, and energizing means containedwithin said outer conductor outside said envelope.

9. In an electronic tube arrangement, an electronic tube including anenvelope, a cathode and an anode in said envelope, means connecting saidcathode with a potential establishing apparatus outside said envelope,means connecting said anode in a potential circuit including apparatusoutside said envelope, conductive shielding means enclosingA thecathode. potential circuit and extending within said envelope,conductive shielding means enclosing said anode potential circuit andextending within said envelope, and conductive means connecting togetherthe shielding means for both said circuits outside said envelope. A

10. A non-grounded circuitarrangement including an electronic tubehaving an envelope, a plurality of electrodes in said envelope, a sourceof energy connected with each said electrode, and conductive shieldingmeans housing each said source of energy and shielding and forming apart of the respective electrode circuit independentiy of the otherelectrode circuits except for a predetermined path for electron iiowwithin the envelope.

11. A non-grounded circuit arrangement including anhelectronic tubehaving an envelope, a plurality of electrodes in said envelope, a sourceof energy connected with each said electtode, and conductive shieldingmeans housing each said source of energy and shielding and forming apart of the respective electrode circuit independently of the otherelectrode circuits except for a predetermined path for electron nowwithin the envelope, certain of said conductive shielding means being inthe form of conduits. the inside surface of one of said conduits beingused as one leg of one circuit and a part of the outside surface of thesame conduit being used as a leg of another circuit.

12. An electronic tube comprising a glass envelope into which anelectrode circuit extends, said circuit including a rst electrode havinga metallic casing extending without the envelope, another electrodecircuit extending into said envelope, said other circuit including asecond electrode having a metallic casing extending without saidenvelope and within the first said metallic casing, and energizing meansfor said circuits 5 within one of said 'metallic caslnss outside saidNumber envelope. 1.383.914 LOUIS H. CROOK. 2,178,775 v 1,645,643REFERENCES CITED l 2,107,387 The following references are of record inthe g'wzm le of this patent:l 1 001,330 2,235,414 UNITED STATES PATENTS2,278,210 Number Name Date 1o 2,223,082 2,280,980 Samuel Apr. 2a, 19422.331.723 2,094,360 Landon Sept. 28, 1937 1,618,319 Weinberger Feb. 22,1927 2,207,346 wom July 16, 1940 ,Number 2,088,722 Potter Aug. 3, 19371I 723324 6 Name Date Hoxie -1.. June 28. 1921 Bunger et al. Nov. 7,1939 Crook Oct. 18, 1927 Potter Feb. 8, 1938 Seiler Aug. 22, 1939Engbert May 14, 1940 White Mar. 18, 1941 Morton Mar. 31, 1942 Van MierloNov. 26, 1940 Perc1va1 v.v oct. 12, 1943 FOREIGN PATENTS.

Country Date France Jan. 13, 1932

